<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avater_box">
        <img src="../assets/logo.png" alt="" />
      </div>
      <!-- 表单区域 -->
      <el-form
        class="input_box"
        :model="loginForm"
        :rules="loginFormRules"
        ref="loginFormRef"
      >
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input
            v-model="loginForm.username"
            prefix-icon="el-icon-user-solid"
          ></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input
            v-model="loginForm.password"
            prefix-icon="el-icon-lock"
            type="password"
          ></el-input>
        </el-form-item>
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //这是登录表单的数据绑定对象
      loginForm: {
        username: "admin",
        password: "123456",
      },
      //这是表单的验证规则对象
      loginFormRules: {
        //验证用户名是否合法
        username: [
          { required: true, message: "请输入用户名", trigger: "blur" },
          {
            min: 3,
            max: 10,
            message: "长度在 3 到 10 个字符",
            trigger: "blur",
          },
        ],
        //验证用户密码是否合法
        password: [{ required: true, message: "请输入密码", trigger: "blur" }],
      },
    };
  },
  methods: {
    //点击重置按钮进行重置
    resetLoginForm() {
      // console.log(this)
      this.$refs.loginFormRef.resetFields();
    },
    login(){
      this.$refs.loginFormRef.validate(async valid =>{
        if(!valid) return;
        //请求后端接口
        //axios返回的值为promise 所以需要await进行转换，同时使用await的时候需要用async组合，进行异步操作 
        const {data :res} = await this.$http.post('login',this.loginForm);
        // console.log(res.meta.status)
        if(res.meta.status !== 200) return this.$message.error('登录失败');
        this.$message.success('登录成功');
        //将登录成功之后的token，保存到客户端的sessionStorage中
        //项目中除了登录之外的其他API接口，必须在登录之后才能访问
        //token只应在当前网站打开期间生效，所以将token保存在sessionStorage中
        // console.log(res);
        window.sessionStorage.setItem('token',res.data.token);
        //通过编程式导航跳转到后台主页，路由地址是/home
        this.$router.push('/Home');
      });
    }
  },
};
</script>

<style scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
}
.login_box {
  width: 450px;
  height: 300px;
  background-color: white;
  border-radius: 3px;
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  margin: auto;
}
.avater_box {
  height: 130px;
  width: 130px;
  border-radius: 50%;
  border: 1px solid black;
  box-shadow: 0 0 10px #ccc;
  background-color: white;
  padding: 10px;
  position: absolute;
  left: 0;
  right: 0;
  top: -65px;
  margin: auto;
}
.avater_box img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background-color: #ccc;
}
.input_box {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}
.btns {
  display: flex;
  justify-content: right;
}
</style>